Spinergy stiffeners type jobbie, stuck on the inside with sticky velcro patches maybe?
Interesting...
A quick search suggests, if I can find some, that they're cheap enough to be worth a gamble.
Im sure you could even just make something similar with some carbon/plastic leftover strips stuck together with some epoxy glue
@Scilly.Suffolk started
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Spinergy stiffeners type jobbie, stuck on the inside with sticky velcro patches maybe?